(You can also use a regular 'whois' client against filtergen.dan.me.uk to get the same output)
Output from Filter List Generator:
% % Filter List Generator % Copyright(c) 2019, Daniel Austin MBCS % % usage: % [-D] [-6] [-RIPE | -RADB | -APNIC] [-f filtername -t filtertype [-upto N]] as-set % % -D for DEBUG mode (shows working calculations) % -6 for IPv6 filter generation % -RIPE for whois.ripe.net lookups % -RADB for whois.radb.net lookups % -APNIC for whois.apnic.net lookups % -f will generate a cisco-style filterlist called 'filtername' (use -t filtertype as follows) % cisco (default) % juniper (basic support) % force10 % mikrotik % Additionally, if using -f/-t you may specify -upto N where N is the prefix size to permit up-to % % Using whois.radb.net for lookups % Generating filter list for 'AS14618' 100.24.0.0/13 103.126.232.0/24 103.145.192.0/24 103.226.68.0/22 103.226.68.0/23 103.226.68.0/24 103.226.69.0/24 103.226.70.0/23 103.226.70.0/24 103.226.71.0/24 103.238.156.0/23 104.193.187.0/24 107.20.0.0/16 107.21.0.0/18 107.21.128.0/17 107.21.64.0/18 107.22.0.0/16 107.23.0.0/17 107.23.128.0/17 109.95.191.0/24 13.248.108.0/24 130.137.137.0/24 130.137.82.0/24 130.137.89.0/24 130.50.125.0/24 131.226.191.0/24 136.184.224.0/24 136.184.225.0/24 137.83.194.0/24 137.83.200.0/24 137.83.201.0/24 137.83.206.0/23 139.180.17.0/24 139.180.244.0/23 139.60.0.0/24 139.60.1.0/24 139.60.3.0/24 142.0.188.0/24 142.0.191.0/24 142.54.38.0/24 142.54.39.0/24 142.54.41.0/24 147.160.167.0/24 148.5.72.0/24 15.177.0.0/21 15.193.6.0/24 155.46.135.0/24 158.247.16.0/20 161.38.192.0/22 162.215.224.0/23 162.247.160.0/24 162.247.162.0/24 163.253.46.0/24 164.153.100.0/24 164.153.101.0/24 168.149.240.0/24 168.149.241.0/24 168.149.246.0/24 168.151.30.0/24 168.245.155.0/24 172.103.40.0/24 173.195.208.0/24 173.195.209.0/24 173.195.210.0/24 173.195.211.0/24 173.213.62.0/24 173.213.63.0/24 173.244.38.0/24 174.129.0.0/16 18.204.0.0/14 18.208.0.0/13 18.232.0.0/14 184.72.128.0/17 184.72.64.0/19 184.72.96.0/19 184.73.0.0/16 185.127.28.0/24 185.143.238.0/24 185.195.0.0/22 185.211.50.0/24 185.48.120.0/22 188.172.137.0/24 188.172.138.0/24 192.111.4.0/24 192.149.210.0/24 192.158.25.0/24 192.159.123.0/24 192.161.148.0/24 192.161.149.0/24 192.161.150.0/24 192.184.73.0/24 192.188.81.0/24 192.225.212.0/24 192.225.215.0/24 192.225.217.0/24 192.225.218.0/24 192.225.219.0/24 192.225.223.0/24 192.92.97.0/24 194.42.104.0/24 194.42.105.0/24 194.42.96.0/24 194.42.97.0/24 195.82.97.0/24 198.136.165.0/24 198.17.127.0/24 198.176.127.0/24 198.177.255.0/24 198.178.114.0/24 198.178.115.0/24 199.188.156.0/24 199.19.192.0/24 199.30.176.0/24 199.30.183.0/24 199.47.128.0/24 199.47.129.0/24 203.119.92.0/23 203.119.92.0/24 203.119.93.0/24 204.153.219.0/24 204.236.192.0/18 204.236.224.0/19 204.75.189.0/24 204.8.28.0/24 204.8.29.0/24 204.8.30.0/24 204.8.31.0/24 205.157.216.0/24 205.167.215.0/24 205.220.189.0/24 206.190.220.0/24 207.64.134.0/23 208.71.23.0/24 208.75.220.0/22 208.78.4.0/23 208.78.6.0/24 208.78.7.0/24 208.79.45.0/24 208.79.47.0/24 208.80.202.0/23 208.84.160.0/24 208.88.208.0/24 208.93.103.0/24 209.222.77.0/24 209.94.74.0/24 216.115.21.0/24 216.115.22.0/24 216.182.224.0/20 216.182.224.0/21 216.182.232.0/21 216.182.232.0/22 216.182.238.0/23 23.131.144.0/24 23.133.224.0/24 23.136.176.0/24 23.141.96.0/24 23.166.224.0/24 23.20.0.0/14 23.20.0.0/15 23.22.0.0/15 3.208.0.0/12 3.224.0.0/12 3.80.0.0/12 34.192.0.0/12 34.224.0.0/12 35.153.0.0/16 35.168.0.0/13 44.192.0.0/11 45.136.240.0/24 45.136.241.0/24 45.136.242.0/24 45.223.13.0/24 45.250.63.0/24 45.250.72.0/22 45.250.72.0/23 45.250.72.0/24 45.250.73.0/24 45.250.74.0/23 45.250.74.0/24 45.250.75.0/24 45.93.188.0/24 46.174.136.0/22 46.51.208.0/22 50.112.0.0/16 50.16.0.0/14 50.16.0.0/16 50.16.245.0/24 50.16.252.0/22 50.17.0.0/16 50.19.0.0/17 50.19.128.0/17 52.0.0.0/15 52.10.0.0/15 52.12.0.0/15 52.128.40.0/24 52.128.41.0/24 52.128.42.0/24 52.128.43.0/24 52.13.252.0/23 52.16.0.0/15 52.18.0.0/15 52.192.0.0/15 52.2.0.0/15 52.20.0.0/14 52.200.0.0/13 52.24.0.0/14 52.28.0.0/16 52.29.0.0/16 52.30.0.0/15 52.32.0.0/14 52.4.0.0/14 52.44.0.0/15 52.48.0.0/14 52.52.0.0/15 52.54.0.0/15 52.58.0.0/15 52.62.0.0/15 52.64.0.0/17 52.64.128.0/17 52.65.0.0/16 52.68.0.0/15 52.70.0.0/15 52.72.0.0/15 52.74.0.0/16 52.76.0.0/17 52.76.128.0/17 52.77.0.0/16 52.8.0.0/16 52.86.0.0/15 52.88.0.0/15 52.9.0.0/16 52.90.0.0/15 52.95.240.0/24 52.95.241.0/24 52.95.242.0/24 52.95.243.0/24 52.95.244.0/24 52.95.245.0/24 52.95.246.0/24 52.95.247.0/24 52.95.248.0/24 52.95.30.0/23 52.95.52.0/22 54.144.0.0/14 54.148.0.0/15 54.150.0.0/16 54.151.0.0/17 54.151.128.0/17 54.152.0.0/16 54.153.0.0/17 54.153.128.0/17 54.154.0.0/16 54.155.0.0/16 54.156.0.0/14 54.160.0.0/14 54.164.0.0/15 54.166.0.0/15 54.168.0.0/16 54.169.0.0/17 54.169.128.0/17 54.170.0.0/16 54.171.0.0/16 54.172.0.0/15 54.174.0.0/15 54.176.0.0/15 54.179.128.0/18 54.179.192.0/18 54.183.0.0/17 54.183.128.0/17 54.184.0.0/15 54.186.0.0/15 54.188.0.0/15 54.190.0.0/16 54.191.0.0/16 54.193.0.0/17 54.193.128.0/17 54.194.0.0/16 54.195.0.0/16 54.196.0.0/15 54.198.0.0/16 54.199.0.0/17 54.199.128.0/17 54.200.0.0/15 54.202.0.0/15 54.204.0.0/15 54.206.0.0/17 54.206.128.0/17 54.207.0.0/17 54.207.128.0/17 54.208.0.0/15 54.210.0.0/16 54.211.0.0/16 54.212.0.0/16 54.213.0.0/16 54.214.0.0/17 54.214.128.0/17 54.215.0.0/17 54.215.128.0/18 54.215.192.0/18 54.216.0.0/15 54.218.0.0/17 54.218.128.0/17 54.219.0.0/17 54.219.128.0/18 54.219.192.0/18 54.220.0.0/16 54.221.0.0/16 54.224.0.0/15 54.226.0.0/15 54.228.0.0/16 54.229.0.0/17 54.229.128.0/17 54.232.128.0/18 54.232.192.0/18 54.233.128.0/17 54.233.64.0/18 54.234.0.0/15 54.236.0.0/18 54.236.128.0/17 54.236.64.0/18 54.237.0.0/16 54.238.0.0/17 54.238.128.0/17 54.240.16.0/24 54.240.24.0/22 54.240.30.0/23 54.240.32.0/20 54.240.48.0/23 54.240.8.0/21 54.241.160.0/19 54.241.192.0/18 54.242.0.0/15 54.244.128.0/17 54.244.64.0/18 54.249.128.0/17 54.249.64.0/18 54.250.0.0/17 54.250.128.0/18 54.250.192.0/18 54.253.0.0/17 54.253.128.0/17 54.254.0.0/17 54.254.128.0/17 54.255.0.0/17 54.255.128.0/17 54.64.0.0/15 54.66.0.0/17 54.66.128.0/17 54.67.0.0/17 54.68.0.0/15 54.70.0.0/15 54.72.0.0/16 54.73.0.0/16 54.74.0.0/15 54.76.0.0/15 54.78.0.0/16 54.79.0.0/17 54.79.128.0/17 54.80.0.0/14 54.84.0.0/15 54.86.0.0/16 54.87.0.0/16 54.88.0.0/16 54.89.0.0/16 54.90.0.0/15 54.92.0.0/17 54.92.128.0/17 54.93.0.0/16 54.93.0.0/19 54.93.128.0/17 54.93.32.0/19 54.93.64.0/18 54.94.0.0/17 54.94.128.0/18 54.94.192.0/18 54.95.0.0/17 54.95.128.0/17 64.238.3.0/24 64.238.7.0/24 64.45.128.0/24 64.45.132.0/24 64.57.14.0/24 64.57.15.0/24 64.57.9.0/24 64.66.45.0/24 64.71.238.0/24 66.59.61.0/24 66.59.62.0/24 67.202.0.0/18 67.226.221.0/24 68.64.4.0/24 69.2.101.0/24 69.64.150.0/24 69.72.40.0/24 69.72.41.0/24 69.72.42.0/24 69.72.43.0/24 72.13.120.0/24 72.13.123.0/24 72.44.32.0/19 72.52.62.0/24 74.112.132.0/24 74.112.133.0/24 74.116.144.0/24 74.122.241.0/24 74.221.131.0/24 75.101.128.0/17 76.223.191.0/24 76.76.17.0/24 85.115.38.0/24 89.251.12.0/24 89.251.13.0/24 91.197.32.0/24 93.191.219.0/24 99.77.128.0/24 99.77.129.0/24 99.77.191.0/24 99.77.254.0/24 % end of filter list for 'AS14618' (418 prefixes found) % took 1.29 secs for query (1.09 secs of connection time) % used 1 connections -- 1259 lines of whois data parsed